[Bug 1826453] Re: Grub2 Booting in blind mode due to "invalid video mode specification `text'"

[Dexuan Cui]

I was not clear about the lifecycle of 16.04 and 14.04. :-)

AFAIK, there is no real need to fix the bug for 14.04. 
And I understand it looks there won't be a 16.04.7, either.

Since the bug is already fixed in 18.04 (and newer? I didn't check
19.xx), it looks to me we can leave it as is for 16.04 and 14.04, and
mark the bug as WON'T FIX, if there is nothing we can really do for
16.04 and 14.04.

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Title:
  Grub2 Booting in blind mode due to "invalid video mode specification
  `text'"

Status in grub2 package in Ubuntu:
  Fix Released
Status in grub2 source package in Trusty:
  New
Status in grub2 source package in Xenial:
  In Progress

Bug description:
  In a Ubuntu 16.04.6 VM, which runs as a Gen2 VM on Hyper-V, I add
  GRUB_GFXPAYLOAD_LINUX="text" into /etc/default/grub and run update-
  grub; next, grub2 prints the below error:

  error: invalid video mode specification `text'. 
  Booting in blind mode 

  This means grub2 passes a zero value for the "lfb_base" to Linux
  kernel, which then fails to reserve the framebuffer MMIO range in
  drivers/hv/vmbus_drv.c: vmbus_reserve_fb(); as a result, when we pass
  through a PCIe device to the VM, the PCIe device may get a PCI MMIO
  BAR in the FB MMIO range, causing a conflict, and the PCIe device can
  not work in the VM.

  The issue can not reproduce with Ubuntu 18.04. It turns out the grub2 in Ubuntu 18.04 has the below fix: 
  video: skip 'text' gfxpayload if not supported, to fallback to default (https://git.launchpad.net/~ubuntu-core-dev/grub/+git/ubuntu/commit/?id=38d9e2f862a96a039ae8ca8b87b8615d154ceda4). 

  I'm asking the patch author (Mathieu Trudel-Lapierre) to submit the
  patch to the upstream grub and this is the upstream bug link:
  https://savannah.gnu.org/bugs/?56217 .

  Here this launchpad bug is for Ubuntu 16.04 and 14.04.

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